scrumpy hands

A tradition in New Zealand. Where someone who is drinking scrumpy cider, tapes a 1.25L bottle either hand and is not allowed to remove them until they have finished the aforementioned bottle/s.
Typically popular in hospitality and university parties.

"Yo josh, did you see that noa is doing scrumpy hands tonight?"
"Lets hope he can finish them before needing to piss"